1.

In how many ways the letters of the word ‘REFERENCES’ can be arranged so that vowels remain together?1). 25202). 8403). 1104). 105

Answer»

REFERENCES

Here? 4 vowels (4 E’s) and 6 consonants (2 R’s, 1 F, 1 N, 1 C and 1 S)

∴ Number of ways to ARRANGE the letters so that vowels are together = 7!/ (4! × 2!)

⇒ 105


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